VSTestV2, PublishTestResultsV1 tasks - migrate to Node 10

[anatolybolshakov]

We need to migrate following to Node 10 - since Node 6 will be removed soon from agent:

• VSTestV2
• PublishTestResultsV1

Related parent issue - #15183

[anatolybolshakov]

@SadagopanRajaram @PBoraMSFT could you please take a look?

[github-actions]

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